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Mixed-dimensional stacked nanocomposite structures for a specific wavelength-selectable ambipolar photoresponse

Nano Research 2024年第6期17卷 5549-5558页

作者： Young Jae Park Jaeho Shim Joo Song Lee Kyu Seung Lee Ji-Yeon kim Kang Bok Ko Sang-Youp Yim seongjun kim Hoon-Kyu Shin Donghee Park Yong Ju Yun Dong Ick Son Institute of Advanced Composite Materials Korea Institute of Science and TechnologyJeollabuk-do 55324Republic of Korea National Institute for Nanomaterials Technology Pohang University of Science and TechnologyGyeongsangbuk-do 37673Republic of Korea Department of Semiconductor Science and Technology Semiconductor Physics Research CenterJeonbuk National UniversityJeonju 54896Republic of Korea Advanced Photonics Research Institute Gwangju Institute of Science and TechnologyGwangju 61005Republic of Korea Center for Opto-Electronic Materials and Devices Post-Silicon Semiconductor InstituteKorea Institute of Science and TechnologySeoul 02792Republic of Korea Graduate School of Energy and Environment(KU-KIST Green School) Korea UniversitySeoul 02841Republic of Korea KIST School Department of Nanomaterials and Nano ScienceUniversity of Science and Technology(UST)Daejeon 34113Republic of Korea

Mixed-dimensional composite structures using zero-dimensional(0D)quantum dots(QDs)and two-dimensional(2D)transition metal dichalcogenides(TMDs)materials are expected to attract great interest in optoelectronics due to the potential to generate new optical ***,we report on the unique optical characteristics of a devices with mixed dimensional vertically stacked structures based on tungsten diselenide(WSe_(2))/CdSeS QDs monolayer/molybdenum disulfide(MoS_(2))(2D/0D/2D).Specifically,it exhibits an ambipolar photoresponse characteristic,with a negative photoresponse observed in the 400-600 nm wavelength range and a positive photoresponse appeared at 700 nm *** resulted in the high negative responsivity of up to 52.22 mA·W^(−1)under 400 nm,which is 163 times higher than that of the photodetector without CdSeS *** also demonstrated the negative photoresponse,which could be due to increased carrier collision probability and non-radiative *** modeling and simulation reveal that Auger recombination among the types of non-radiative recombination is the main cause of negative photocurrent ***,we discovered ambipolar photoresponse near a specific wavelength corresponding to the energy of quantum *** study revealed interesting phenomenon in the mixed low-dimensional stacked structure and paved the way to exploit it for the development of innovative photodetection materials as well as for optoelectronic applications.

关键词： mixed-dimension quantum dot heterostructure photodetector ambipolar photoresponse

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Short-Term Effects of Experimental Warming and Precipitation Manipulation on Soil Microbial Biomass C and N, Community Substrate Utilization Patterns and Community Composition

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Pedosphere 2017年第4期27卷 714-724页

作者： Guanlin LI seongjun kim Minji PARK Yowhan SON Department of Environmental Science and Ecological Engineering Graduate SchoolKorea UniversitySeoul 02841Korea Department of Biological and Environmental Sciences Qatar UniversityDoha 2713Qatar

Soil microorganisms are major drivers of soil carbon(C) cycling;however,the response of these microorganisms to climate change remains *** the present study,we investigated how 18 months of multifactor climate treatments(warmed air temperature by 3℃ and decreased or increased precipitation manipulation by 30%) affected soil microbial biomass C and nitrogen(N),community substrate utilization patterns,and community *** and increased precipitation significantly reduced microbial biomass C by 13.5% and 24.9% and microbial biomass N by 22.9% and 17.6% in unwarmed plots,respectively(P<0.01).Warming enhanced community substrate utilization by 89.8%,20.4%,and 141.4% in the natural,decreased,and increased precipitation plots,***,warming significantly enhanced the utilization of amine and carboxylic acid substrates among all precipitation manipulation *** with the natural air temperature with natural precipitation treatment,other treatments affected fungal community richness by -0.9% to 33.6% and reduced the relative abundance of the dominant bacterial and fungal groups by 0.5% to 6.8% and 4.3% to 10.7%,*** warming and/or precipitation manipulation treatments significantly altered Zygomycota abundance(P<0.05).Our results indicate that climate change drivers and their interactions may cause changes in soil microbial biomass C and N,community substrate utilization patterns,and community composition,particularly for the fungal community,and shifts in the microorganism community may further shape the ecosystems function.

关键词： bacterial community, climate change, community abundance, community diversity, community richness, fungal com-munity

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Analysis of opto-thermal interaction of porcine stomach tissue with 808-nm laser for endoscopic submucosal dissection

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Journal of Innovative Optical Health Sciences 2015年第6期8卷 81-91页

作者： seongjun kim M.Tamim Hossain Don Haeng Lee Jung Kyung kim Department of Mechanical Engineering Graduate School Kookmin University Seoul 136-702Republic of Korea Department of Integrative Biomedical Science and Engineering Graduate SchoolKookmin University Seoul 136-702Republic of Korea Division of Gastroenterology Department of Internal Medicine Inha University School of Medicine National Center of Efficacy Evaluation for the Development of Health Products Targeting Digestive Disorders Utah-Inha DDS&Advanced Therapeutics Research Center 27 Inhang-ro Jung-guIncheon 400-711Republic of Korea Department of Mechanical Engineering Kookmin University Seoul 136-702 Republic of Korea

In endoscopic submucosal dissection(ESD),the narrow gastrointestinal space can cause difficulty in surgical *** ablation apparatuses with high-power CO_(2) lasers or Nd:YAG lasers have been developed to facilitate endoscopic surgical *** studied the interaction of 808-nm laser light with a porcine stomach tissue,with the aim of developing a therapeutic medical device that can remove lesions at the gastrointestinal wall by irradiating a near-infrared laser light incorporated in an endoscopic *** perforation depths at the porcine fillet and the stomach tissues linearly increased in the range of 2–8mm in proportion to the laser energy density of 63.7–382 kJ/cm^(2).Despite the distinct structural and compositional di®erence,the variation of the perforation depth between the stomach and the fillet was not found at 808-nm wavelength in our *** further studied the laser–tissue interaction by changing the concentration of the methyl blue solution used conventionally as a submucosal fluidic cushion(SFC)in ESD *** temperature of the mucosal layer increased more rapidly at higher concentration of the methyl blue solution,because of enhanced light absorption at the SFC *** insertion of the SFC would protect the muscle layer from thermal *** confirmed that more effective laser treatment should be enabled by tuning the opto-thermal properties of the *** study can contribute to the optimization of the driving parameters for laser incision techniques as an alternative to conventional surgical interventions.

关键词： Near-infrared laser surgical intervention laser-tissue interaction submucosal fluid cushion temperature distribution

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Graphene-GaN Schottky diodes

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Nano Research 2015年第4期8卷 1327-1338页

作者： seongjun kim Tae Hoon Seo Myung Jong kim Keun Man song Eun-Kyung Suh Hyunsoo kim School of Semiconductor and Chemical Engineering Semiconductor Physics Research Center Chonbuk National University Jeonju 561-756 Republic of Korea Soft Innovative Materials Research Center Korea Institute of Science and Technology Jeonbuk 561-905 Republic of Korea Korea Advanced Nano Fab Center Suwon 443-700 Republic of Korea

在 undoped 上形成的 graphene Schottky 接触的电的特征轧了半导体被调查。有 10 的校正比率的优秀修正行为在業慮楴湯漠 ? 敭慴汬捩瀠瑡獨愠牣獯 ? 桴 ? 潳牵散搯慲湩攠敬瑣潲敤 ? 祢映牯業杮琠敨渠湡浯獥 ? 瑳畲瑣牵 ? 湩琠敨栠杩... 详细信息

在 undoped 上形成的 graphene Schottky 接触的电的特征轧了半导体被调查。有 10 的校正比率的优秀修正行为在業慮楴湯漠 ? 敭慴汬捩瀠瑡獨愠牣獯 ? 桴 ? 潳牵散搯慲湩攠敬瑣潲敤 ? 祢映牯業杮琠敨渠湡浯獥 ? 瑳畲瑣牵 ? 湩琠敨栠杩 ? 敤獮瑩 ?坓呎渠瑥潷歲挠慨湮汥的 7 ？？

关键词：肖特基二极管 GaN 石墨氮化镓半导体势垒高度表面状态整流特性肖特基整流器

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Soil depth- and root diameter- related variations affect root decomposition in temperate pine and oak forests

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Journal of Plant Ecology 2019年第5期12卷 871-881页

作者： Seung Hyun Han seongjun kim Hanna Chang Hyun-Jun kim Asia Khamzina Yowhan Son Department of Environmental Science and Ecological Engineering Graduate SchoolKorea UniversityAnam-DongSeongbuk-GuSeoul 02841Republic of Korea

Aims Assessment of factors regulating root decomposition is needed to understand carbon and nutrient cycling in forest *** ob-jective of this study is to examine the effects of soil depth and root diameter on root decomposition and to analyze the relationship of root decomposition with factors such as soil environmental conditions and initial litter *** two decomposition experiments were conducted in natural pine(Pinus densiflora)and oak(Quercus serrata)forests over a 2-year period using the litterbag *** the soil depth experiment,216 litterbags containing fine roots(∅=0-2 mm)were buried at 0-10-,10-20-and 20-30-cm soil *** properties and soil enzyme activities and microbial biomass at each soil depth were *** the root diameter experiment,216 litterbags containing roots 0-1-,1-2-and 2-3-mm in diameter were buried at 10-cm soil *** initial litter qualities(carbon(c),nitrogen(N),calcium(ca)and phosphorus(P)concentrations)for each of the root diameter classes were *** were retrieved after 3,6,12 and 24 months in each forest *** Findingsthe root decomposition rate was significantly altered by soil depth and root *** 2 years,the root decay constant at 0-10-cm depth(pine:0.35 and oak:0.41)was significantly higher than that at 10-20-cm(0.31 and 0.37)and 20-30-cm(0.32 and 0.33)depths in the *** and *** *** activities and microbial biomass declined with soil depth,which may be associated with decreasing soil moisture and organic *** decay constant for the 0-1-mm roots(pine:0.32 and oak:0.37)was higher than that of 1-2-mm(0.29 and 0.33)and 2-3-mm roots(0.26 and 0.33)for the *** and *** *** in initial P concentration and c/N ratio among the different diameter roots were linearly related with root *** particular,the increasing c/N ratio with root diameter resulted in decreases in the decomposition *** re

关键词： decomposition stage litter quality soil environmental condition soil microbial activity

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Estimating the production and mortality of fine roots using minirhizotrons in a Pinus densiflora forest in Gwangneung,Korea

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Journal of Forestry Research 2016年第5期27卷 1029-1035页

作者： Seung Hyun Han Soonjin Yun Jongyeol Lee seongjun kim Hanna Chang Yowhan Son Department of Environmental Science and Ecological Engineering Graduate SchoolKorea University Department of Forest Conservation Korea Forest Research Institute Department of Biological and Environmental Sciences Qatar University

The aim of this study was to estimate fine root production （FP） and fine root mortality （FM） at 0-10, 10-20, and 20-30 cm soil depths using minirhizotrons in a 75-year-old Pinus densiflora Sieb. et Zucc. forest located in Gwangneung, Korea. We developed the conversion factors （frame cm-2） of three soil depths （0.158 for 0-10 cm, 0.120 for 10-20 cm, and 0.131 for 20-30 cm） based on soil coring and minirhizotron data. FP and FM were estimated using conversion factors from March 26, 2013 to March 2, 2014. The annual FP and FM values at the 0-30 cm soil depth were 3200.2 and 2271.5 kg ha-1 yr -1, respectively. The FP estimate accounted for approximately 17 % of the total net primary production at the study site. FP was highest in summer （July 31-September 26）, and FM was highest in autumn （September 27-November 29）. FP was positively correlated with seasonal change in soil temperature, while FM was not related to that change. The sea- sonality of FP and FM might be linked to above-ground photosynthetic activity. Both FP and FM at the 0-10 cm depth were significantly higher than at 10-20 and 20-30 cm depths, and this resulted from the decrease in nutrient availability with increasing soil depth. The minirhizotron approach and conversion factors developed in this study will enable fast and accurate estimation of the fine root dynamics in P. densiflora forest ecosystems.

关键词： Conversion factor Fine root Minirhizotron Mortality Production

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Forest structure and carbon dynamics of an intact lowland mixed dipterocarp forest in Brunei Darussalam

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Journal of Forestry Research 2018年第1期29卷 199-203页

作者： Sohye Lee Jongyeol Lee seongjun kim Yujin Roh Kamariah Abu Salim Woo-Kyun Lee Yowhan Son Department of Environmental Science and Ecological Engineering Graduate School Korea University Environmental and Life Sciences Faculty of ScienceUniversiti Brunei Darussalam Department of Biological of Environmental Sciences Qatar University

Tropical forests play a critical role in mitigating climate change because they account for large amount o terrestrial carbon storage and ***,there are many uncertainties associated with the estimation o carbon *** estimated forest structure and carbon dynamics along a slope（17.3°–42.8°）and to assess the relations between forest structures,carbon dynamics,and slopes in an intact lowland mixed dipterocarp forest,in Kuala Belalong,Brunei *** biomass,basa area,stand density,crown properties,and tree family composition were measured for forest *** rate,litter production,and litter decomposition rates were also measured for carbon *** crown form index and the crown position index were used to assess crown properties,which we categorized into five stages,from very poor to *** living biomass,basal area and stand density were 261.5–940.7 Mg ha-1,43.6–63.6 m2ha-1and 6,675–8400 tree ha-1,*** average crown form and position index were 4,which means that the crown are mostly symmetrical and sufficiently exposed for *** mean biomass growth rate,litter production,litter decomposition rate were estimated as11.9,11.6 Mg ha-1a-1,and 7.2 g a-1,*** growth rate was significantly correlated with living biomass,basal area,and crown *** form appeared to strongly influence living biomass,basal area and biomass growth rate in terms of light ***,basal area,stand density,crown properties,and biomass growth rate did not vary by slope or tree family *** results indicate that carbon accumulation by tree growth in an intact lowland mixed dipterocarp forest depends on crown *** of any effect of tree family composition on carbon accumulation suggests that the main driver of biomass accumulation in old-growth forests of Borneo is not species-specific characteristics of tree species.

关键词： Carbon dynamics Growth rate Litter flux Lowland mixed dipterocarp forest Slope

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Flexural Bond Behavior of Rebar in Ultra-High Performance Concrete Beams Considering Lap-Splice Length and Cover Depth

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Engineering（科研） 2016年第3期8卷 116-129页

作者： seongjun kim Jungwoo Lee Changbin Joh Imjong Kwahk Korea Institute of Civil Engineering and Building Technology Goyang South Korea

This study intends to find out the correlation between the cover depth and the bond characteristics of UHPC through pull-out tests of UHPC specimens with different cover depths and bond tests of rebar using flexural members. In this experimental study, specimens are fabricated with the lap-splice length as test variable in relation with the calculation of the lap-splice length for 180- MPa UHPC. Moreover, specimens are also fabricated with the cover depth as test variable to evaluate the effect of the cover depth on the UHPC flexural members. The load-displacement curves are analyzed for each of these test variables to compute the lap-splice length proposed in the K-UHPC structural design guideline and to evaluate the influence of the cover depth on the flexural members. As a result, the stability of the structural behavior can be significantly enhanced by increasing slightly the cover depth specification of the current UHPC Structure Design Guideline from the maximum value between 1.5 times of rebar diameter and 20 mm to the maximum value between 1.5 times of rebar diameter and 25 mm.

关键词： Bond Behavior Ultra High Performance Concrete (UHPC) Lap-Splice Length Cover Depth Flexural Bond Test Full-Out Test

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Is quantum capacitance in graphene a potential hurdle for device scaling？

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Nano Research 2014年第4期7卷 453-461页

作者： Jaeho Lee Hyun-Jong Chung David H. Seo Jaehong Lee Hyungcheol Shin Sunae Seo seongjun Park Sungwoo Hwang Kinam kim Samsung Advanced Institute of Technology Samsung Electronics Yongin-Si Gyeonggi-Do 446-712 Korea Inter-University Semiconductor Research Center (ISRC) School of Electrical Engineering and Computer Science Seoul National University Seoul 151-742 Korea Division of Quantum Phases and Devices Department of Physics Konkuk University Seou1143-701 Korea Semiconductor R&D Center Somsung Electronics Hwasung-City Gyeonggi-Do 446-711 Korea Department of Physics Sejong University Seou1143-74 7 Korea Memory Division Samsung Electronics Hwasung-City Gyeonggi-Do 446-711 Korea

Transistor size is constantly being reduced to improve performance as well as power consumption. For the channel length to be reduced, the corresponding gate dielectric thickness should also be reduced. Unfortunately, graphene devices are more complicated due to an extra capacitance called quantum capacitance (C Q) which limits the effective gate dielectric reduction. In this work, we analyzed the effect of C Q on device-scaling issues by extracting it from scaling of the channel length of devices. In contrast to previous reports for metal-insulator-metal structures, a practical device structure was used in conjunction with direct radio-frequency field-effect transistor measurements to describe the graphene channels. In order to precisely extract device parameters, we reassessed the equivalent circuit, and concluded that the on-state model should in fact be used. By careful consideration of the underlap region, our device modeling was shown to be in good agreement with the experimental data. C Q contributions to equivalent oxide thickness were analyzed in detail for varying impurity concentrations in graphene. Finally, we were able to demonstrate that despite contributions from C Q, grapheme’s high mobility and low-voltage operation allows for graphene channels suitable for next generation transistors.

关键词：电容元件石墨缩放量子等效氧化层厚度场效应晶体管有效介电常数设备结垢

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